A scoping review examining patient experience and what matters to people experiencing homelessness when seeking healthcare

Background Homelessness is associated with significant health disparities. Conventional health services often fail to address the unique needs and lived experience of homeless individuals and fail to include participatory design when planning health services. This scoping review aimed to examine areas of patient experience that are most frequently reported by people experiencing homelessness when seeking and receiving healthcare, and to identify existing surveys used to measure patient experience for this cohort. Methods A scoping review was undertaken reported according to the PRISMA-ScR 2020 Statement. Databases were searched on 1 December 2022: MEDLINE, EMBASE, APA PsychINFO and CINAHL. Included studies focused on people experiencing homelessness, healthcare services and patient experience, primary research, published in English from 2010. Qualitative papers and findings were extracted and synthesized against a modified framework based on the National Institute for Health and Care Excellence guidelines for care for people experiencing homelessness, the Institute of Medicine Framework and Lachman’s multidimensional quality model. People with lived experience of homelessness were employed as part of the research team. Results Thirty-two studies were included. Of these, 22 were qualitative, seven quantitative and three mixed methods, from the United States of America (n = 17), United Kingdom (n = 5), Australia (n = 5) and Canada (n = 4). Health services ranged from primary healthcare to outpatient management, acute care, emergency care and hospital based healthcare. In qualitative papers, the domains of ‘accessible and timely’, ‘person-centred’, and values of ‘dignity and respect’ and ‘kindness with compassion’ were most prevalent. Among the three patient experience surveys identified, ‘accessible and timely’ and ‘person-centred’ were the most frequent domains. The least frequently highlighted domains and values were ‘equitable’ and ‘holistic’. No questions addressed the ‘safety’ domain. Conclusions The Primary Care Quality-Homeless questionnaire best reflected the priorities for healthcare provision that were highlighted in the qualitative studies of people experiencing homelessness. The most frequently cited domains and values that people experiencing homelessness expressed as important when seeking healthcare were reflected in each of the three survey tools to varying degrees. Findings suggest that the principles of ‘Kindness and compassion’ require further emphasis when seeking feedback on healthcare experiences and the domains of ‘safety’, ‘equitable’, and ‘efficiency’ are not adequately represented in existing patient experience surveys. Supplementary Information The online version contains supplementary material available at 10.1186/s12913-024-10971-8.

and compassion' require further emphasis when seeking feedback on healthcare experiences and the domains of 'safety' , 'equitable' , and 'efficiency' are not adequately represented in existing patient experience surveys.Keywords Homeless, Patient experience, Health services, Healthcare, Access to care, Outcome measures, Surveys, Scoping review

Background
Homelessness is associated with large disparities in health, including a much higher prevalence of both chronic conditions and acute illness and injury [1][2][3].This perpetuates disproportionate rates of unplanned hospital use [4] and a three-decade gap in life expectancy [5,6].Despite significant health needs, people experiencing homelessness (PEH) face numerous barriers to accessing health services and preventive healthcare [7,8] and are more likely to seek emergency or unplanned healthcare [4,9].This is often at a later stage of ill health, leading to lengthy and costly hospital admissions [7].Individual and structural factors associated with homelessness impact peoples' capacity to attend appointments, advocate for the support they need and maintain regular contact with health providers that is necessary to improve their health and wellbeing.Among PEH, structural barriers and discrimination are ubiquitous experiences when accessing healthcare [8,10].Current evidence associates the experience of stigma for PEH with the perpetuation of existing health inequalities, service avoidance, and subsequent poorer physical and mental health [10][11][12].The anachronistic and hierarchical design of many conventional health services is counterproductive to the required trauma-informed approach that facilitates PEH or those experiencing marginalisation and vulnerability to access healthcare when they need it.It is clear that the traditional approach to designing healthcare services could be much improved if PEH were engaged in the process and their voices prioritised".
Continual improvement of healthcare informed by patient experience is critical for all populations, particularly for PEH given the substantial health disparities and known barriers to healthcare access and engagement.In an effort to tackle health inequities for PEH, health systems must continuously monitor and improve the quality of healthcare they provide [8].Capturing patient experience across healthcare settings is paramount to drive service improvement [13] and promote more equitable access, especially among PEH.In 2001, the Institute of Medicine (IOM) conceptualised quality principles across six dimensions for improvement (safe, effectiveness, patient-centred, timely, efficient and equitable) in an effort to raise the quality of health care [14].Measurements of quality healthcare have previously focused heavily on access, clinical care processes, disease-specific indicators and mortality [15].As part of contemporary healthcare delivery, patients' experiences of healthcare are considered an indicator of the quality of care [15].Patient experience is central to improvements in the provision of quality health care [13,14,16] and has been positively associated with patient safety and clinical effectiveness [13,17], higher levels of treatment adherence and less healthcare utilisation [13,17].Patient experience is distinct from patient satisfaction in that it asks about the person's experience of healthcare rather than simply whether they were satisfied or not.This experience-focused feedback provides valuable insights into the quality of care provided and is fed back to providers [16].Experiences may differ according to the vulnerability of population groups and patient expectations [16].Surveys and reports on patient experience provide a means of intrinsically evaluating and measuring aspects of care quality from the patient's perspective, principally offering healthcare services an opportunity to capture and appraise 'patient-centred care' as a domain of quality [14,15].Patient-centred care is key to the provision of quality health care [17] and has been highlighted as a priority for homeless healthcare [8].

Aim
The aim of this scoping review was to examine the areas of patient experience that are most frequently reported by PEH when seeking healthcare, and how the patient experience for people experiencing homelessness is represented and discussed in the literature and what deficits exist.A secondary objective of this review is to understand what surveys, or components of surveys, are being used to ask about patient experience for PEH.

Study context and rationale
The study was undertaken in Australia to inform the development of evidence-based strategies for homeless health services.In Australia, the number of PEH is rising [18].In 2021, there were over 122,000 estimated PEH on any given night, an increase of more than five percent over five years [18].Existing structured patient-reported experience survey methods have limited applicability for vulnerable populations in Australian hospitals [19].For example, the Australian Hospital Patient Experience Question Set (AHPEQS) [20], does not adequately report the perspectives of people with low health literacy -a population that is over-represented among PEH [21].Furthermore, patient experience measures in Australian Primary Healthcare (PHC) settings are not well established, nor standardised [22] and therefore little is known about the accessibility or experiences of these services for PEH.The impetus for this study was thus to identify the ways in which patient experiences of healthcare for PEH has been measured or captured in the international literature to inform the development of homeless healthcare services at the organisation.

Search strategy
A scoping review was undertaken to explore the broad research aim reported here using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) [23].The search strategy was identified and refined by the authorship team, comprising health service managers, academics, people with lived experience of homelessness and clinicians, through an iterative process.Two of the authors had significant experience in providing healthcare to PEH, and three were experienced researchers in homeless health.A librarian was engaged to assist with the initial identification of search terms.The PICO framework was used to develop the search terms and eligibility criteria, as shown in Table 1.The intervention of interest was patient experience for PEH when seeking and receiving healthcare.
Three preliminary searches were conducted to identify and test search terms.The final search terms were as follows: Patient reported outcome measures OR patient outcome assessment OR patient satisfaction; Health facilities OR health services OR quality of healthcare OR patients OR (health* or hospital* or patient* or outpatient* or emergency department*.ti,ab,kw.)Health services accessibility OR access*.ti,ab,kw.Searches were grouped with the relevant keyword terms of (patient* or outpatient* or inpatient*) OR (consumer* or client* or adult* or people*) and matched with a set of adjectives with a defined adjacency of two in an effort to capture patient experience.The adjectives utilised were experience* or reported* or perspective* or perceive* or feedback* or complaint* or view* or voice* or preference* or satisfaction* or insight*.ti,ab,kw.
The final search was conducted on 2 February 2024 across the following databases: Medical Literature Analysis and Retrieval System Online (MEDLINE), Excerpta Medica Database (Embase), American Psychological Association PsychINFO and Current Index to Nursing and Allied Health Literature (Cinahl).The final search strategy and terms adapted for each database are available (See Additional file 1).
All search results were exported to EndNote (X9.3.3,Clarivate) and uploaded to the online systematic review collaboration software Covidence (Veritas Health Innovation, Melbourne, Australia) (Available at www. covid ence.org).Duplicates were automatically discarded.The titles and abstracts were screened independently by two authors.Conflicts were resolved by a third author.Screening of full-text papers was conducted as described above.To ensure alignment with PHC and hospital services, recency of reported experience and the Australian healthcare system, articles focusing on specialised health services/diseases, accessibility, years 2008/2009, and non-OECD countries were excluded.Systematic reviews that were identified during the screening process were reviewed for any eligible references.

Data items and extraction
Data extraction occurred through three phases.In Phase 1, the primary author extracted the following core characteristics from included papers: author, year, country, title, study design, objective, population, setting, exposure (inclusive of type of health service) and patient experience measure.To ensure the accuracy of this process, an independent review of the extraction was undertaken by two authors.In Phase 2, the authorship team sought a framework to meaningfully extract and then code the qualitative patient experience data from the included studies and three were identified: the National Institute for Health and Care Excellence (NICE) guidelines for integrated health and social care for people experiencing homelessness [24], the Institute of Medicine (IOM) Framework for Health Care Quality [25], and Lachman's multidimensional quality model [26].The NICE guidelines, developed in the United Kingdom, are a comprehensive resource for working with PEH.The IOM framework is a well-established quality framework used in healthcare to align policy and practice.The IOM domains are a set of principles that are used to guide and improve the quality of healthcare delivery.Lachman's quality framework builds on the existing IOM principles, offering a new and novel means of assessing quality in healthcare.These three frameworks were modified by removing any overlap to form one extraction framework.The authors added the domain of 'communication' to address an obvious deficit in existing frameworks as identified in the NICE guidelines [24] and recent literature [27].See Tables 2 and 3 for established definitions.
The findings of the included papers were extracted against the modified framework by six authors (JPM, JH, CD, LW, SV, JC) simultaneously over three meetings.In some instances, the patient-reported outcomes overlapped between the two domains, perhaps indicating the complexity and subjectivity of patient-reported experiences.Final decisions were made by two authors (JM, CD).
In Phase 3, data from quantitative studies that used a survey to measure patient experience were extracted.Two surveys were excluded from the analysis because they did not have patient experience measures [28,29].The following data points were extracted from patient experience surveys: 1) survey name, 2) authors utilising survey, 3) number of survey items 4) number of domains (referred to as scales hereafter to ensure differentiation from the term used in the extraction framework), 5) survey setting, 6) survey questions 7) assignment of survey questions to IOM domains and core values.Data were grouped together for surveys appearing in multiple articles.Data points were extracted directly from articles with the exception of data point 7 which was completed by reviewers (See Additional file 2).Four authors individually analysed each survey question and assigned a primary domain or core value to each.Responses were reviewed by all authors, and any disagreements were discussed and resolved through a consensus vote.

Study selection
One thousand eight hundred thirty-eight records were identified through the database searches, ultimately thirty-two studies were included in this scoping review.Details of the screening process are shown in Fig. 1.

Study characteristics
Of the 32 included studies, 22 were qualitative, seven were quantitative and three were mixed-method study designs (see Tables 4, 5 and 6).Seventeen studies were from the United States of America (US), five from the United Kingdom (UK), five from Australia and four from Canada.Seventeen studies examined the provision of primary health care, with the remaining studies examining outpatient case management [30], acute care [28], emergency care [31], and hospital-based healthcare [29,32].Twelve studies did not define a specific health service context and instead reported information on general patient experiences engaging with any area of health services.The tools utilised across the studies included interviews (n = 20), focus groups [29,31,[33][34][35][36] (n = 7), surveys [32,[37][38][39][40][41][42][43] (n = 8), and qualitative ranking exercise [44] (n = 1) to facilitate exploration of patient experience.The qualitative ranking exercise asked PEH and experts to prioritise 16 aspects of PHC.
Most (n = 24) studies did not detail how PEH were identified.Of those that did, five studies used the International Classification of Diseases (ICD)-9 or ICD-10 code to identify PEH [32,38,39,41,43], one study used Veterans Health Administration administrative records [42], one study used clerical staff to identify PEH by accommodation status on arrival to ED [49] and one study used staff to recruit participants as per the homeless definition in the Stewart B. McKinney Homeless Assistance Act [57].Sample sizes of PEH ranged from five [52] to 68 [31] for qualitative studies and 33 [32] to 5,766 [42] for quantitative studies.Three of the studies from the US examined homeless veterans [39][40][41].

Qualitative study results
This section describes firstly the results from the 24 qualitative studies reviewed including the frequency of domains and core values and key themes (Table 7).

Accessible and timely incorporates timeliness and access
The domain of 'person-centred' was cited in 18 of the qualitative articles.Person-centred care incorporates the diverse experiences of individuals and their specific needs and priorities.Repeatedly, participants valued services that recognised the complexities relating to homelessness and which tailored services to meet their needs [33,34,52,53].PEH greatly appreciated the social capital gained from health services, in particular positive social interaction, shared norms and decreased feelings of isolation [30,46,53].Participants described experiences of institutional practices inconsistent with patient-centred care [31,51,54], rushed treatment [35,45,56] and a lack of awareness of PEH and the complexity of their healthcare needs [28,29,45].
The domain of 'Safety' encompassed physical and psychological safety, trauma-informed care and health accountability, and was raised in 17 of the 23 qualitative articles.Safety for PEH was most often discussed in relation to the physical environment of health services [46,53], discharge practices [28,31,53] and rapport with healthcare personnel [30,54,59].However, cases of physical assault by security personnel [36], mechanical restraint [31], and stigma from health professionals had a negative impact on their willingness to access services [33,45,52].While accountability was considered an important characteristic [44], in only one paper did PEH expressed concerns that health services were not accountable [29].
The 'equitable' refers to care being fair and impartial regardless of individual traits or circumstances, and was domain identified in 16 of the articles reviewed.Examples of equity arose most commonly regarding prejudicial care [29,31,33,48,51,52,55,56,58] and healthcare service exclusions [29,45,49,50], with one example reported describing a possible violation of the Emergency Medical Treatment and Labor Act [50].'Efficient' appeared in 14 articles, referring predominantly to the navigation and coordination of services across providers and settings.A common issue raised was the struggle PEH experienced navigating healthcare systems [30,33,34,45,50,52,58].Instances varied from difficulty understanding health systems [45,52,58] to the inherent complexity of referral systems [50] and paperwork [58].A lack of healthcare insurance also exacerbated difficulties with service navigation in a US-based paper [52].Case workers or navigators who could help facilitate the navigation of services were seen as critical enablers [30,33,34,36,52].In circumstances where PEH accessed 'navigational aids' , greater usage and higher levels of satisfaction with health services were reported [52].Although in a paper by Steward (2016), coordination ranked as one of the four most important characteristics of homeless healthcare service provision [44], multiple negative accounts were reported describing episodes of fragmented care [35,36], wasted time [33], service gaps [31], a lack of coordination between services [28] and problematic relationships with interdisciplinary teams [33].In one study, 44% of PEH delaying healthcare attributed this to previous experiences and concerns that they would not receive appropriate healthcare [28].Positive experiences recounted the arrangement of hospital admissions [53], seamless system navigation [31], centralised care coordination that reduced the need for ED presentations [33], and effective coordination and timely referrals that alleviated service user stress [34].
The 'effective' domain that pertains to care following evidence-based guidelines and standard operating procedures was the least frequently articulated domain in the qualitative papers reviewed (10 citations), with Steward et al. (2016), independently reporting that PEH highly prioritised 'evidence-based decision making' [44].On the few occasions the effective domain was highlighted in the literature, it involved treatment based on individual biases and stereotypes [33,50], inconsistent discharge practices [45] and pain management regimens [35,36].
'Partnership and co-production' was raised in 17 of the articles reviewed.This value refers to how PEH can be engaged and active partners in designing healthcare and the delivery of services.Integral to this core value is patients at the centre of control.PEH placed high value on decision-making [55]; they wanted to set their own agendas, be asked what they needed, and be allowed to decide for themselves [54].In one circumstance, PEH perceived that they were full partners with a sense of control over their care, even reporting freedom and an increased choice to change health providers [33].However, the characteristic of patients as a 'source of control' in PHC was ranked relatively low (10 out of 16) [44], and some patients were ambivalent about control when discussing pain and controlled substances [55].PEH appreciated continuity of care and being able to see the same providers consistently [55,59].Although care could be inconsistent or suboptimal [45], overly prescriptive [52], or constrained by distrust in healthcare professionals [29,46,52,53], there was acknowledgement that experiences and engagement improved with time and upon building therapeutic relationships.[35,36,46,53,56] The 'Holistic' core value was identified in 16 articles.It refers to care that is integrated and addresses physical, emotional, social, spiritual and mental wellbeing.Several articles highlighted failures to provide holistic care [31,33,45,49].In one article, PEH reported a lack of inquiry into their housing status, with only 44% being assessed during an acute care episode [28].On the contrary some publications demonstrated endeavours to provide holistic care [30,46] and the positive effects of treating patients as individuals with personal needs and goals [34].
The core value of 'communication' incorporates communication methods, information sharing and awareness of services and was raised in 14 articles.On several occasions, it was apparent that PEH were unaware of their health entitlements and existing outreach, after-hours or primary health care services due to a lack of signposting and communication [35,45,49,51,54,55].This insufficiency in communication extended beyond the realm of access and navigation of services and into treatment care and follow-up, and PEH reported circumstances where communication with kin did not occur [31], unclear post discharge management plans [53] and a system-level reliance on postal and telecommunication methods that was unsuitable for this cohort [55].PEH ranked 'shared knowledge and the free flow of information' in the top 25th percentile of important characteristics of homeless care [44].People experiencing homelessness called for greater communication between hospitals and shelters during discharge in an effort to improve the coordination of care [28].

Quantitative study results
The following section reports on the characteristics, settings and frequency at which domains and core values were reported in surveys across the quantitative papers.
Ten articles were initially identified with survey components [28,29,32,[37][38][39][40][41][42][43], however two were excluded from the analysis, as the surveys contained no patient experience questions [28,29].The remaining eight articles utilised an original or adaptation of one of three patient experience surveys [32,[37][38][39][40][41][42][43].Surveys ranged from having 15 items to 33 items and four to seven scales.Across different scales and their respective questions, the frequency of domains and values identified and authenticated ranged from one to seven, and of the 16 scales reviewed, only six scales were identified to exclusively reflect a single domain or value.
The Primary Care Quality-Homeless (PCQ-H) questionnaire was the most frequent survey tool, appearing in five articles.The Consumer Assessment of Healthcare Providers and Systems Survey (CAHPS) was utilised twice, and one study utilised a modified version of the Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey.Each of these three survey tools are discussed below in additional detail.Across all three patient experience surveys, the majority of questions pertained to the 'person-centred' and 'accessible and timely' domains, followed by the core values of 'dignity and respect' and 'communication' .Together, these four domains and values constitute 67% of survey questions.The fewest questions were dedicated to the domains of 'effective' 'equitable' , 'holistic' and 'partnership and co-production' .The least frequently highlighted domains and values were 'equitable' and 'holistic' , with one out of three surveys detailing corresponding questions.No questions addressed the 'safety' domain (See Table 8).

Primary Care Quality-Homeless (PCQ-H) questionnaire
The PCQ-H was the most comprehensive survey; it covered all domains and values with the exception of 'safety' and 'holistic' .General constructs of the PCQ-H survey were based on IOM publications [25,63], a card sort exercise [44] and qualitative interviews and focus groups with PEH and homeless care provider experts [60].The PCQ-H is advantageous, as it is the only survey reviewed that has been specifically developed for and that has had its validity and reliability determined for PEH [60].This is important because the concerns and needs of PEH differ from those of the general population and may be overlooked in standard survey instruments.The PCQ-H has been specifically designed to account for low literacy comprehension (seventh grade reading level) to ensure understandability [60].The majority of authors utilised the PCQ-H in its entirety with the exception of Jones (2021), who only utilised the 11-item Access/Coordination scale from the PCQ-H.

Consumer Assessment of Healthcare Providers and Systems Clinician and Group (CG-CAHPS)
The CG-CAHPS survey questions identified eight of the 11 IOM domains and core values, with the exception of 'safety' , 'effective' and 'equitable' .The CAHPS surveys were originally designed to compare service providers and assist consumers in judging health plans [64,65]; however, the CG-CAHPS was initially developed to measure patient experiences in ambulatory care [61].Behl-Chada, (2017) and Jones, (2017) both utilised modified surveys based on version 2.0 of the CG-CAHPS, with supplementary Patient-Centered Medical Home (PCMH) items to allow for a more comprehensive assessment of PHC and patient experience.The psychometric properties of the CG-CAHPS have been reported to be acceptable [61].

Modified Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey
The HCAHPS survey covered just over half of the IOM domains and core values.The standard HCAHPS survey is typically 27 items; however, Vellozzi-Averhoff utilised fewer items in their study [32].The HCAHPS survey is used among hospitals for inpatient care, which allows for cross-industry service quality comparison.A study on the psychometric properties of HCAHPS raised concerns about the consistency, reliability and validity of multipleitem measures for service quality [66].Furthermore, the sampling frame utilised for the development of HCAHPS excluded patients who were not discharged 'home' based on the premise that these patients were less likely to respond to surveys [67].As a result, differing responses from PEH may not be reflected within the existing psychometric properties of HCAHPS.

Summary of results for domains and core values
' Accessible and timely' and 'person-centred' domains were identified in the literature as the most prominent domain 20 and 18 times in the literature respectively.Moreover in two out of the three patient experience surveys, these two domains were more commonly identified in survey questions.The core values of 'dignity and respect' , 'partnership and co-production' and 'communication' were highlighted between 14 and 20 times and were reported across all three surveys.'Efficient' and 'kindness with compassion' were highlighted 14 and 20 times, respectively, and both were reported in two surveys.The 'effective' domain was described the least in the literature (10 times) but was identified in two surveys.The 'equitable' and 'holistic' domains were described in 15 articles each; however, 'equitable' only appeared in the PCQ-H survey, and 'holistic' only appeared in the CAHPS survey.The 'safety' domain was cited in 17 articles; however, no survey questions addressed the safety domain.

Discussion
The most frequent domains and core values that emerged upon review of the literature for PEH healthcare experiences were 'accessible and timely' , 'person-centred' , 'dignity and respect' and 'kindness with compassion' .Of the three existing patient experience surveys identified in this field, the PCQ-H most accurately encompasses the findings voiced in the qualitative literature.Less emphasis was found in the patient experience data on 'communication' , 'effective' and 'efficient' than seen in the surveys.

Accessible and timely care
' Accessible and timely' care was the domain raised most throughout the literature, and the corresponding survey questions were plentiful and comprehensive.Quantitative survey questions positively encompass the preferences of PEH, giving consideration to wait times, flexibility, convenience and location of services.Historically, PEH have reported significant barriers to accessing care [68], with accessibility highlighted as a top priority by both patients and providers [44].Given the competing priorities of PEH to meet physiological needs such as shelter and food, it is understandable that health needs are best met in an opportunistic fashion.

Kindness, compassion, dignity and respect, and person-centred care
Provision of 'person-centred' care was highlighted across both types of studies and is considered fundamental to the provision of quality care; it is associated with improved health outcomes and healthcare utilisation [69].In the literature, PEH consistently valued healthcare that acknowledged homeless-specific needs and tailored services.Perhaps the most fitting question measuring patient experience for 'person-centred' care was: 'My primary care provider makes sure health care decisions fit with the other challenges in my life' from the PCQ-H.'Kindness with compassion' and 'dignity and respect' were the most common values identified in qualitative articles and were moderately represented in patient experience surveys.These core values are central to patient-centred care frameworks [24,70].Patient experience of health care services are impacted by a multitude of factors including the behaviours and attitudes of healthcare and professional staff [19].Respect is considered an essential part of building trusting relationships between PEH and providers [71].Whilst, kindness with compassion embodied as non-judgemental and empathetic communication can enhance service engagement among PEH [71].
Survey questions relating to the value 'dignity and respect' were aimed at authenticating the provision of treatment with courtesy and respect, as well as addressing concerns of anonymity and confidentiality.Whereas survey questions relating to the value 'kindness and compassion' affirmed the provision of non-judgemental care non-directly, they did not explicitly ask to what extent were clinicians and non-clinicians empathetic, nonjudgmental, warm and welcoming.Questions addressing these values may be less common in surveys due to an inherent difficulty related to quantifying, assessing and measuring abstract ideas such as kindness, respect and dignity.

Safety, choice, control and holistic care
There is extensive literature documenting the clear relationship between exposure to trauma, poor mental health, and chronic homelessness [72].For people who have experienced significant trauma, a sense of choice and control over their healthcare is important [73].In order to engage in effective and meaningful healthcare, individuals must connect and feel safe in the therapeutic relationship.
Primary care is often best placed to develop safe relationships and access community-based services.The 'safety' domain was cited in 17 articles; however, no patient experience survey questions explicitly addressed whether providers made them feel safe.Physical and psychological safety was identified by PEH as being important to patient experience.Of note four articles emphasised the importance of trauma-informed care [29,35,46,52] and one article raised cultural safety [29].Although these topics were highlighted by their respective authors and not raised categorically by PEH themselves.
Within the 'partnership and coproduction' value, it is clear that PEH value autonomy around decision-making.Yet the survey questions pertaining to this value allude more so to 'consultation' in designing health as opposed to patients as a source of control.There were no survey questions directly related to the strength of therapeutic relationships with healthcare professionals, although some questions assigned to the person-centred domain do reflect the quality of patient-provider relationships.Authors, including researchers with lived experience; observed the notable absence of cultural safety and gender sensitivity in the articles.and gender minorities are disproportionately represented in youth homelessness [74][75][76] and experience higher rates of trauma [75].The same minority groups are subject to increased safety risks, and report lower levels of perceived safety when entering shelters and services [75].Cultural safety is an indigenous-led model of care that was born in New Zealand [77].There are varying interpretations of cultural safety; however, broadly speaking, definitions encompass power differentials between patient and provider and subsequent associated barriers to clinical effectiveness arising from said power differentials [78].Distinctive from cultural competency, cultural safety focuses and reflects upon the culture of the clinician, the provision of care, and the healthcare environment [78].Cultural safety is an important consideration when examining patient experience of PEH, as indigenous populations are overrepresented in homelessness.In 2021, one in five (20.4%)PEH in Australia identified as Aboriginal and or Torres Strait Islander [18].Similarly, Indigenous and First Nations people from the United States, Canada and New Zealand are overrepresented among homeless populations [79][80][81].Cultural safety is intimately linked to health equity and notions of power [78].For this reason, it is anticipated there would be some cross-over between the safety and equity domains.Despite this potential for overlap, there were no clear examples of discrimination or racism against indigenous PEH cited under equity, and only one article detailed concerns about prejudicial care specific to ethnicity [51].Similarly, none of the studies reviewed recounted patient experiences specific to sexual and gender minority groups.Although, several articles acknowledged potential limitations of their studies due to gender [28,34,35,51].
An absence of coverage on cultural safety could be reflective in that only a few studies were from Australia and Canada, where cultural safety has gained greater traction within healthcare.Furthermore, patient experience extracted from qualitative articles relating to the 'safety' domain may in fact be underrepresented or incomplete.It is possible that safety has not been captured in its entirety, as patients were not explicitly asked about 'safety' or these sentiments were captured via the 'kindness with compassion' value, which includes warm and approachable clinicians and empathetic and nonjudgemental care.Moreover, there is an element of safety that could be assumed or interpreted via other statements from PEH or that is postulated as being built into existing health structures and models of care.Therefore, the inclusion of specific survey questions focused on the 'safety' domain may offer a more accurate portrayal of safety for PEH hereafter.Primary experience surveys did not routinely include questions addressing 'safety' .The exploration of safety as a domain identified by PEH and healthcare providers is a clear gap in the literature that needs to be explored in future studies to develop a shared understanding of this important concept.
Safety, trust, choice, control and collaboration in care are important elements of trauma-informed care [82].As a result, trauma-informed care crosses over into the 'holistic' , 'partnership and co-production' and 'kindness with compassion' values.Consideration should be given to the inclusion of survey questions to measure safety and trauma informed care.(e.g., do you feel safe when attending healthcare services, considering both your physical well-being and emotional well-being?, how safe and supported do you feel in the healthcare setting in terms of addressing your individual needs and experiences?).
Survey questions that were exclusively assigned to the 'holistic' value were found to be predominantly focused on mental health, and with the exception of one question enquiring about alcohol and substance use, failed to ask patients more broadly about their wellbeing and factors affecting their health.Albeit only one of the three surveys was specifically designed for PEH, none of the surveys had questions pertaining to housing, which for PEH is a critical component to stability, security and health.

Effective and equitable care
The literature suggests that effectiveness is more likely to be recognised by health providers than by services users [83] and may in part explain why the 'effective' domain was infrequently cited.Paucity in articles may be due to scepticism or a lack of relevance to PEH, as evidencebased practice has previously been perceived by PEH as an authoritative top-down approach that reinforces existing modalities of care [84].Despite the necessity of lived experience to shape the application and interpretation of evidence-based practice, lived experience perspectives and expertise are frequently omitted or poorly utilised [84].The 'effective' domain tended to appear in the literature due to grievances with a lack of adherence to evidence-based guidelines and standard operating procedures and therefore may also reflect concerns about inequity as PEH received treatments based on biases and stereotypes.
The 'equitable' domain was not commonly investigated, but it is important because it holds the potential to quell concerns of PEH and expose incidences of prejudicial care, lesser care and or service exclusions.Example questions from the PCQ-H include (Staff at this place treat some patients worse if they think that they have addiction issues) and (At this place, I have sometimes not gotten care because I cannot pay).A more general question that purely focuses on prejudicial care may be of benefit due to its broader applicability (e.g., in your healthcare experiences, to what extent do you feel that care is provided fairly and without bias, regardless of your individual traits or circumstances?).Potential future survey questions could include whether or not PEH felt their care adhered to required guidelines and standards.

Efficiency and communication
Despite a common theme pertaining to PEH struggling with the navigation of health care services, only one of the five efficient survey questions somewhat reflected this concern: (My primary care provider helps to reduce the hassles when I am referred to other services).No survey questions clearly enquired as to whether PEH received assistance or experienced difficulty navigating services.The remaining 'efficient' questions focused on the coordination of services and patient follow-up.The primary discourse for the core value of 'communication' related to PEH's awareness of services and health entitlements.Yet only one survey question clearly represented this notion.Rather, the majority of 'communication' survey questions relate to the quality of communication provided by health professionals and whether it was understandable to the individual.

Future directions and implications for practice
In our analysis, we have made an effort to integrate findings from both qualitative research and surveys.We recognise the intrinsic value, richness and depth provided by qualitative research, which is insightful and more comprehensive than survey findings alone.Given our setting of a hospital service, we hope to gather information that can contribute to the development of patient experience measures, ultimately enhancing the healthcare provided to PEH.To ensure health services are capturing the experience of PEH accurately, surveys and measures of patient experience must be tailored to reflect what matters to PEH when accessing healthcare.For healthcare services that care for PEH, utilising patient experience measures that are adjusted to reflect the complexity of the population increases the acceptability of results and aids fairer comparison across practices [16].
Generic surveys utilised on this cohort are incomplete and inadequately inform patient experience, at times overlooking broader notions of health, and the underlying social determinants of health (such as housing) that may take precedence over outright health needs.Existing surveys do not adequately portray and incorporate all the IOM domains and core values, this is most apparent for 'safety' , 'equitable' , and 'efficient' .Further research is needed to explore whether surveys are asking the correct questions to inform patient experience for PEH.Furthermore, it is possible that themes identified by PEH may also hold value for other marginalised or vulnerable groups who experience healthcare inequities and subsequently poorer health outcomes.In the interests of improving equitable care across healthcare services, themes around personal interactions, as identified in this paper, should be better considered.Further research is needed on whether sufficient patient experience data may be collected via the addition of a subset of questions specific to homelessness to an existing generic survey.Patient experience is complex and multifaceted, and positive measurements in one domain or value may not always translate to quality in other domains or values.Surveys that ask only binary or close-ended responses may fail to capture key patient perspectives and contextual information that is important to PEH [85].
The PCQ-H was most commonly utilised survey tool for PEH in primary research.It was developed with extensive involvement of PEH and has evidence of scientific rigour [60].Potential further research could include the adaptation and validation of the PCQ-H in other healthcare settings (e.g., hospital based care).This study supports the establishment of the PCQ-H survey as the current gold standard within the primary healthcare setting for PEH.This is indicated by its reflection most closely of themes identified in the qualitative literature.
Challenges exist in routinely collecting patient experience measures in healthcare settings [86,87].Whilst existing studies do not specifically examine PEH, the completion of patient experience measures is impacted by social determinant of health [87], and barriers are transferable and applicable to PEH; such as language proficiency, health literacy, technology literacy, cognitive functioning and time constraints [86].For PEH additional barriers to survey engagement may include: stigma, poor mental health, substance or alcohol abuse, competing priorities, the transient nature of homelessness and high rates of discharging from health services against medical advice.Co-design projects and tailored approaches are required to overcome barriers and optimise the collection of patient experience data [88], in turn assessing and exploring how healthcare organisations can best respond to the findings so that healthcare for PEH can be improved.Possible directions for future research include developing the findings, such as incorporating a Delphi design and further validation studies to refine survey recommendations for these broader healthcare services.

Strengths and limitations
A strength of this study was the involvement of people with lived experience of homelessness in the design, analysis and interpretation of the papers.The inclusion of people with lived experience provided contextual understanding to the topic, ensured relevance and enhanced authenticity and validity of the study.A further strength of this paper was that it includes both qualitative and quantitative research papers, this allowed for a more comprehensive understanding of the topic and a triangulation of findings to address the scoping aim and secondary objectives.The degree of detail possible by using the extended domains framework assisted in framing the studies in domains that were especially relevant for PEH.This paper also utilised rigorous methodology by having studies reviewed by multiple researchers to reach consensus on domains and core values.
A limitation of this study was the exclusion of specialised health services or disease-focused articles, as there may have been relevant findings from these articles that were applicable to other healthcare settings and PEH.There is a possibility that in determining and allocating a singular primary domain or core value to each survey question, that survey data was simplified and lost some of its breadth.Although the research team undertook a rigorous technique for coding the domains and values, there were instances where more than one domain or value was found to be applicable despite agreed upon definitions.The majority of questions were allocated with consensus.
A significant limitation is that the majority of studies were from the US and four other OECD countries and may not extrapolate to other settings.However, the findings involving domains and core values have the potential to be interpreted universally.OECD countries were chosen so as the findings could be applied to healthcare service development for PEH at the main study site.Due to the large number of articles, grey literature on patient experience was not reviewed.Grey literature may have offered additional value to our study.Lastly, this study was also limited in that exploration of patient experience was confined to existing published research, it is possible that there are elements of patient experience for PEH that are not adequately reflected in the published literature.

Conclusion
When measures patient experience for PEH, questions pertaining to how the provider treats them, including if they felt respected, if they were shown kindness and compassion, if they were made to feel safe, and if they felt listened to need to be captured alongside how effective and accessible treatment was.This study identifies that 'kindness and compassion' questions should be further emphasised when seeking feedback on healthcare experiences from PEH.The domains of 'safety' , 'equitable' , and 'efficiency' are not adequately represented in existing patient experience surveys.
The PCQ-H was the survey that best reflected the priorities in healthcare provision identified by qualitative analysis and may be suitable to extend to other healthcare settings.Of note, although safety is identified as being a priority for PEH, this was not identified in any of the surveys.
Communication was not a feature of themes recognised as important in qualitative studies, but elements of communication may have been included in other domains.The literature shows that many of the most frequently cited domains and values that PEH expressed to be most important when seeking healthcare were reflected in the three identified survey tools used to varying affect.

Table 1
PICO Framework a Threshold for homelessness was ≥ 50% of sample currently experiencing homelessness papers/abstracts, letters to the editor, book sections/reviews, systematic reviews, literature reviews English language, 2010-2022 Published prior to 2010 Not an OECD Country Tool/Survey unavailable or not related to patient experience

Table 2
Modified framework of quality domainsDefinitions taken from Lachman's multidimensional quality modelThemes within boxes shaded in grey were taken from NICE guidelines for integrated health and social care for people experiencing homelessness

Table 3
Modified framework of quality core valuesDefinitions taken from Lachman's multidimensional quality model, with the exception of the communication definition, which was developed by the authors Themes within boxes shaded in grey were taken from NICE guidelines for integrated health and social care for people

Table 4
(continued) PEH People Experiencing Homelessness, FTF Face-to-face, QI Quality Improvement, VA Veteran Affairs a Purkey 2019 survey excluded from analysis as no patient experience measures

Table 5
Mixed methods PEH People Experiencing Homelessness, FTF Face-to-face, VA Veteran Affairs a Greysen 2012 survey excluded from analysis as no patient experience measures

Table 6
Quantitative studies

Table 6 (
continued) PEH People Experiencing Homelessness, FTF Face-to-face, VA Veteran Affairs, VHA Veteran Health Administration

Table 7
IOM Domains & core values

Table 8
Patient experience surveys and how they map to IOM domains and core values a Jones, 2017 had six-items under the access domain (compared to four-items with Behl-Chadha, 2017), one additional CAHPS item, one additional PCMH item, surveys otherwise utilised similar structured questions throughout CG-CAHPS